Just Thinkin About That Stock Exaust System.

[WOEII]

Something like this?
Attachment 1686

Woof! More intel please!

[Eli54]

Do you want power or just noise?

[JimmyMac]

If obnoxiously loud is cool....you'd be the Coolest Cat of them all Daddy'O

[JimmyMac]

Do you want power or just noise?

Yeah...they want power. If your gonna build something, you'll need some cam specs too. (I just read your other post)

I'd shoot for something tuned in the middle of the powerband...big expansion chamber with a two into one ...maybe a merge collector....

Drag pipes don't cut it....hell, drag bikes don't even run drag pipes anymore.

Looking foward to seeing what you come up with!!

JMac

[WOEII]

Do you want power or just noise?

John Deere has the RSX at I think 62hp.
The engine can produce 76.1 hp at 8,000 rpm on the Aprilia?s Mana 850 GT ABS so I say snag some of that lost HP!
https://www.apriliausa.com/en-US/Mode...Technical.aspx

[JimmyMac]

If you can give me the bore, stroke and cam numbers, I'll figure the numbers for pipe diameter, length and steps. That's pretty easy.

The muffler volume, diameter, length and tapers are a little more work. About 14 formulas worth if I can remember.

Think the powerband is about 2500 rpms? Like 5500 to 8000?